应用于升压型DC-DC的新颖软启动电路的设计

›› 2015, Vol. 28 ›› Issue (6): 170-.

应用于升压型DC-DC的新颖软启动电路的设计

管要宾

(西安电子科技大学电路CAD研究所,陕西西安 710071)

出版日期:2015-06-15 发布日期:2015-06-20
作者简介:管要宾(1989—),男,硕士研究生。研究方向:模数模混合集成电路设计。E-mail:guanyaobin4305@126.com

Design of a Novel Soft-start Circuit Applied to Step-Up DC-DC

GUAN Yaobin

(Institute of Electronic CAD,Xidian University,Xi'an 710071,China)

Online:2015-06-15 Published:2015-06-20

摘要/Abstract

摘要：

提出了一种新颖的软启动电路,实现了输出电压无过冲平滑启动。该电路有效抑制了DC-DC开关电源上电启动过程出现的浪涌电流和输出电压的过冲,同时该软启动电路克服了传统软启动电路无法带载启动的缺点。电路完全集成在芯片内部,避免了使用额外电容而占用过多面积。利用Cadence Spectre仿真平台对电路进行了仿真验证,仿真结果表明,在输入电压为2.4~4.2 V的同步升压DC-DC芯片中,负载在0~2.1 A范围内启动,均未出现电感电流和输出电压的过冲。

关键词: 软启动, 升压型DC/DC, 过冲, 带载启动

Abstract:

This paper proposes a novel soft-start circuit,which raises the output voltage from zero to regulated value smoothly.This circuit effectively suppresses the DC-DC switching power supply inrush current and output voltage overshoot during startup.At the same time,the soft-start circuit overcomes the shortcoming that the traditional soft-start circuit can not start up with heavy load.This circuit is easy to integrate into the DC-DC regulator,because we do not use the external capacitor which takes too much area.The Cadence Spectre simulation platform is used for circuit simulation and verification.In the synchronous boost DC-DC chip with an input voltage of 2.4~4.2 V,the load starts up within the range of 0~2.1 A,and neither inductor current nor output voltage overshoot appears.

Key words: soft start;boost DC DC;overshoot;start up with heavy load

中图分类号:

TN86

管要宾. 应用于升压型DC-DC的新颖软启动电路的设计[J]. , 2015, 28(6): 170-.

GUAN Yaobin. Design of a Novel Soft-start Circuit Applied to Step-Up DC-DC[J]. , 2015, 28(6): 170-.